On Tue, Apr 04 2006, Bill Davidsen wrote:
> Vishal Patil wrote:
> >Maintain two queues which will be sorted in ascending order using Red
> >Black Trees. When a disk request arrives and if the block number it
> >refers to is greater than the block number of the current request
> >being served add (merge) it to the first sorted queue or else add
> >(merge) it to the second sorted queue. Keep on servicing the requests
> >from the first request queue until it is empty after which switch over
> >to the second queue and now reverse the roles of the two queues.
> >Simple and Sweet. Many thanks for the awesome block I/O layer in the
> >2.6 kernel.
> >
> Why both queues sorting in ascending order? I would think that one
> should be in descending order, which would reduce the seek distance
> between the last i/o on one queue and the first on the next.
Then it wouldn't be CSCAN, now would it? :-)
--
Jens Axboe
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
